Electric-circuit controller and alarm.



A. G OLDSTEIN. I ELECTRICAL CIRCUIT CONTROLLER AND ALARM.

APPLICATION FILED AUG. 6, 1910.

Patented Mar. 14, 1911.

UNITED STATES PATENT OFFICE.

ALBERT GOLDSTEIN, OF YORK, N. Y., ASSIGNOR TO INTERNATIONAL ELECTRIC PROTECTION COMPANY, A CORPORATION OF NEW YORK.

ELECTRICAL-CIRCUIT CONTROLLER AND ALARM.

Specification of Letters Patent.

Patented Mar. 14, 1911.

Application filed August 6, 1910. Serial No. 575,901.

To all whom it may concern:

Be it known that I, ALBERT GOLDSTEIN, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Electrical- Circuit Controllers and Alarms, of which the following is a specification.

The invention is an electrical circuit controller and alarm.

It embodies in a single apparatus, means for imposing a frequency on the current on the circuit and for producing an audible alarm signal, which means are controlled by a thermostat. The thermostat preferably comprises a chamber of thin metal, from which, upon an increase of surrounding temperature, an air flow is conveyed to said I means to cause the operation thereof.

The object of imposing a frequency upon the current is to permit a suitable responsive device, preferably at a distance, to be actuated, so that the apparatus upon an increase in the surrounding temperature both gives a local alarm and produces the frequency current suitable for the operation of said distant device.

The accompanying drawing is a longitudinal section of the apparatus, which is shown attached to a wall .or ceiling A.

B is a hollow cylindrical casing of iron, having a partition C. 'To the under or outer side of the partition is secured the electromagnet D, having a tubular pole piece E. Through the coil and pole piece passes the brass rod F, which is connected at its lower end to a boss G on a sheet iron diaphragm H secured to the outer open end of the casing. The inner or upper end of rod .F' extends through the leaf spring I, above which it is headed. Said spring is secured at one end to a lug on the partition C.

material, which ring rests against the wall 1 to the chamberM by means of a metal tube I T, which, as here shown, passes outside of the casing and through the wall thereof and through the artition K. The placing of tube T outside 0 the casing is not essential, since it may obviously be disposed within the same in any suitable way. A metal horn U having a shoulder V is seated in'its smaller end in the circular space inclosed by the annular air chamber S.

The operation is as follows: When the atmosphere surrounding chamber S becomes heated and the air in said chamber expands at a rate'in excess of that determined by the size of the vent N, said expanded air flows from said chamber through duct T to the chamber beneath diaphragm L, and raises said diaphragm to meet the contact carried by spring 0; Circuit is then established from plus conductor, to coil D, to contact J, spring I, casing B, diaphragm L, contact and spring 0, and so to the minus conductor. The magnet, however, in raising diaphragm H, lifts rod F and so permits spring I to rise, thus causing circuit to be intermittently opened and closed between contact J and spring I. A frequency is thus imposed upon the current on the circuit and the diaphragm H is set in rapid vibration, producing an audible alarm which is amplified by the horn U. This alarmcontinues soundlng until the condition of the atmosphere permits the diaphragm L to break circuit with spring 0.

It is to be noted that the annular air chamber S is placed-on the outer part of the apparatus and is arranged so that air may have access to it on both sides, the device, in this way, being rendered more sensitive to atmospheric temperature changes.

I claim:

1. The combination of an electro-magneticallyoperated alarm device, including a vibrating sound producing diaphragm, a casing therefor having an openi ng in front of said diaphragm, an annular chamber having rounding said opening, means actuated by air flow from said chamber for closing circuit to said alarm device, and aduct for conveying said air flow from said chamber to said means.

2. The combination of a casing, a partition dividing said easing into two compartments and provided with an air opening, two diaphragms respectively on opposite sides of said partition, electro-magnetic means in said casing for vibrating one of said diaphragms, a chamber having walls of thin metal supported on said casing and communicating with the space between said walls of thin heat conducting material surpartition and said other diaphragm, and a contact in proximity to said last-named diaphragm, the said electro-magnetic means, last-named diaphragm and contact being connected in circuit.

In testimony whereof I have aflixed my signature in presence of two witnesses.

ALBERT GOLDSTEIN. Witnesses:

GERTRUDE T. PORTER, MAY T. MCGARRY. 

